Electric dynamo.



W. K. HOWE.

ELECTRIC DYNAMQ.

APPLICATION FILED APR. 28, 1913 Patented Oct. 20, 1914.

1N VEN TOR. 71 M,

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innate;

Patented Oct. 20, 1914.

' Applicatiimtiledi'kpril28,1913. -SerialNo.764,190.

To all ffl/IIHIL it may concern: r

Be, it known that I,'\\'ix'rnnor I\. Hows, a citizen of the United $tates, and a restdent of the city ofli'ochester, in thecounty ()ther' objects and advantagesot the in" veuliou will appear as the description of the invention progresses, and the novel features of the invent'km'will be particularly pointed out in the appended claims.

ln describing the invention in detail, reference. will be had to the accompanying drawings, wherein l have illustrated a preferred physical en'ibodunent of my mven tion." and wherein like characters ofieferenco designate corresponding parts throughout the several views and in which:

Figure l, is a side elevation of a dynamo embodying my invention; Fig. 2, is a sectional elevation of the dynamo illustrated by Fig. l omitting the armature, on the line 11- -1; looking in the direction of the arrows;

Fig. 3, is a perspective view of the body forming the armature space and the poles of the dynamo as shown inl ig. 1; Fig.4, is a detail view of an expanding means used in my invention; Fig. 5, is a fragmentary dctaii view of the body surrounding the armature space as shown in Fig. 1.

l, designates the lield ofnmagnetie material of a dynamo; .2, designates poles cast integrally therewith; 3, designates field coils placed on the poles 2; 4. designates an armature which may be of any well known and approved form.

' Applicant forms the poles 2 integral with the body 1 and then by one machine operation dresses the outer ends of the poles 2 so as to form them as the are of a circle, An annulus, which may be purchased in the open 'inarket, of magnetic material 5', split lengthwise as zit-(i, is then placed in position as shown in Fig. 3 bearing against t to poles 2. This annulus is selected of such a size that it tits snugly between the poles. A threaded rod 7 is then put in position as best shown by Figs. 3 and 5, and a cone nut 8 is screwed onto its threaded end. The

of this invention is a design cone shaped head of the rod 7 and the cone nut 8, fit in cone shaped cavities on either' side ofthe annulus 5, so that when the nut is tightened, the annulus 5 is slightly en? larged in .diameter-sothat it then bears very tirmlyvagainst the ends of the poles 2, so that it cannot move. As heretofore mentioned the annulus 5, before being expanded, fit's. quite tightly between-the poles 2,150 that the tightening of the rod 7 does not distort the annulusrfi to any appreciable extent so that its inner surface still remains practically a true circle.

The armature/i, is made the proper size so that it may rotate within the annulus 5 with 'the,proper mechanical and electrical clearances.

-'lhe-annulus 5, has cut-away portion as ,at, 9, so vas to. prevent thefree flow of magnetic flux, from pole. to pole and cause it to low as it should through the magnetic material of which the armature 4 is composed.

The construction described is such that a ened and the annulus 5 may then be rotated so that the center of the pole face will be so shifted that the brushes will be at the neutral point.

Applicants construction is such that, a form wound coil may be. used containing the minin'ium amount 0 wire; a minimum munber of machine operations is required; and that which serves as the pole face may be rotated about the armature so that a fixed brush holder maybe used Although I have particularly described the construction of one physical embodiment of my invention,-ani'l explained the operation and principle thereof; nevertheless, I desire to have it understood that the form selected is merely illustrative, but does not exhaust the possible physical embodiment of the idea of means nnderlying'my invention.

\Vhat I claim as new and desire to secure by Letters Patent of the United States, is:

In a dynamo: a field magnet of magnetic material formed with polar projections, a form wound coil of insulated wire on'cach polar projection; a split annulus of magnetic material inserted between diametrically opposite polar projections for formin" an armature space; said annulus former with cone shaped cavities on either side, one other cavity, the said nut and bolt causing half of the cone shaped xzavitles being on the annulus to expand and press firmly 10 one side of the division caused by s litting against the polar projections so as to be held the annulus and the other half of t e cavfirmly in position ities being on the other side; a bolt formed I \VINTHROP K. HOWE. with a threaded end and a cone shaped head Witnesses: fitting into one cavity and a nut screwed on LILLIAN LXPHILLIPS,

the threaded end of e bolt fitting into the IJORETTA M. SPIESS. 

